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Impact of Molecular Weight on Molecular Doping Efficiency of Conjugated Polymers and Resulting Thermoelectric Performances

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Title
Impact of Molecular Weight on Molecular Doping Efficiency of Conjugated Polymers and Resulting Thermoelectric Performances
Author(s)
Sang Eun Yoon; Bomi Kim; So Yeon Chun; Sang Yeon Lee; Dohyeon Jeon; Minju Kim; Solin Lee; Bo Eun Seo; Kang Suh Choi; Felix Sunjoo Kim; Taekyeong Kim; Hyungtak Seo; Kyungwon Kwak; Jong H. Kim; BongSoo Kim
Publication Date
2022-08
Journal
ADVANCED FUNCTIONAL MATERIALS, v.32, no.32
Publisher
WILEY-V C H VERLAG GMBH
Abstract
The effect of molecular weight of a series of conjugated polymers (CPs) on the doping efficiency, electrical conductivity, and related thermoelectric properties of doped CPs is studied. Low (L), medium (M), and high (H) molecular weight batches of PDFD-T polymers, based on difluorobenzothia-diazole and dithienosilole moieties, are synthesized and denoted as PDFD-T(L), PDFD-T(M), and PDFD-T(H), respectively. Furthermore, to compare the effects of different donor moieties, donor units of PDFD-T(L) are structurally modified from thiophene to thienothiophene (TT) and dithienothiophene (DTT), denoted as PDFD-TT(L) and PDFD-DTT(L), respectively. After doping the CPs with FeCl3, d-PDFD-T(H) exhibits an electrical conductivity of 402.9 S cm(-1), which is significantly higher than those of d-PDFD-T(L), d-PDFD-T(M), d-PDFD-TT(L), and d-PDFD-DTT(L). The highest power factor of 101.1 mu W m(-1) K-2 is achieved through organic thermoelectric devices fabricated using PDFD-T(H). Through various characterizations, it is demonstrated that CPs with a high molecular weight tend to have a high carrier mobility while maintaining their original crystallinity and good charge trans- port pathways even after doping. Therefore, it is suggested that optimizing the molecular weight of CPs is an essential strategy for maximal power generation from their doped CP films.
URI
https://pr.ibs.re.kr/handle/8788114/12284
DOI
10.1002/adfm.202202929
ISSN
1616-301X
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > 1. Journal Papers (저널논문)
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